Lightolier 7790QD Page 2 of, 7 3/8” Aperture A19 / A21 / MB19 Fresnel Lenslite, Job Information

	Calculite® Incandescent Lensed Downlight 7790QD
Page 2 of 2	7 3/8” Aperture A19 / A21 / MB19 Fresnel Lenslite

40								100 Watt A-19
FOOTCANDLES								1750 Lumens Per Lamp
35								RCR = 1 (Rm. Width - 10 x Mtg. Ht. above work plane)
30								RCR = 5 (Rm. Width - 2Mtg. Ht. above work plane)
25								RCR = 10 (Rm. Width - Mtg. Ht. above work plane)
								Room Surface Reflectances:
20								80% Ceiling; 50% Walls; 20% Floor
INITIAL 10
15
5
		25		50			75	100	125	150	175	200
					AREA PER FIXTURE IN SQUARE FEET
3	4	5	6	7		8	9	10	11	12	13	14

CENTER TO CENTER DISTANCE OF FIXTURES IN FEET

Use quick calculator chart to determine spacing of luminaires for desired level of illumination.

Conversion Factors: 150W A21, F.C. X 1.4
￿
	Spacing Ratio = 1.3
100W A19
		Candlepower Summary
	90	DEG	CP	ZONAL FLUX
		0	484
		5	492	47
100		15	551	156
		25	558	258
	60
		35	389	244
		45	181	140
200		55	71.0	64
		65	25.4	25
		75	2.0	2
300		85	0	0
		90
400	30
		ZONE	LUMENS	LAMP
		0-30	461	26.5
500		0-40	705	40.5
		0-60	909	52.0
		0-90	936	53.5
E.T.L, Inc. report No. 390909
Date: 06-24-64
Efficiency: 52.0%

COEFFICIENTS OF UTILIZATION

% EFFECTIVE CEILING CAVITY REFLECTANCE

			80				70			50			30			10		0
		50	30	10				% WALL REFLECTANCE							50	30	10	0
						50	30	10	50	30	10	50	30	10
	1	.59	.57	.56	.58		.56	.55	.55	.54	.53	.53	.52	.52	.51	.51	.50	.49
RATIO	2	.54	.52	.50	.53		.51	.49	.51	.49	.48	.50	.48	.47	.48	.47	.46	.45
	3	.50	.47	.44	.49		.46	.44	.47	.45	.43	.46	.44	.42	.45	.43	.42	.41
	4	.45	.42	.40	.45		.42	.39	.44	.41	.39	.43	.40	.38	.41	.40	.38	.37
CAVITY
	5	.42	.38	.35	.41		.38	.35	.40	.37	.35	.39	.37	.35	.38	.36	.34	.33
	6	.38	.35	.32	.38		.34	.32	.37	.34	.32	.36	.34	.31	.036	.33	.31	30
ROOM	7	.35	.32	.29	.35		.31	.29	.34	.31	.29	.33	.31	.29	.33	.30	.28	.28
	8	.32	.28	.26	.32		.28	.26	.31	.28	.26	.31	.28	.26	.30	.27	.25	.25
	9	.29	.26	.23	.29		.25	.23	.28	.25	.23	.28	.25	.23	.28	.25	.22	.22
	10	.27	.23	.21	.27		.23	.21	.26	.23	.21	.26	.23	.21	.25	.22	.20	.19

20% FLOOR CAVITY REFLECTANCE

Conversion Factor: For 150W A21 units, multiply C.U.s by 0.9

Job Information	Type:
Lightolier a Genlyte Thomas Company	www.lightolier.com

631 Airport Road, Fall River, MA 02720 • (508) 679-8131 • Fax (508) 674-4710 We reserve the right to change details of design, materials and finish.

© 2002 Genlyte Thomas Group LLC (Lightolier Division) • A0902